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the fuse on the unit may have broke or the breaker for the unit ay have tripped, check the breaker and if thats fine check the manual to see if there is a fuse and where it is located. If it is the fuse you can get a replacement at your local hardware store.

you need to replace the light fitting holder as this is the reason the system failed.As to why the circuit breaker failed that is a mater for an electricion,because i would suspect a majour fault on the home electrical system.adrian.

You should be able to grab them with the tips of your fingers. If not you can try a rubber jar opener mat. I can usually just get them to crack loose with the tips of my fingers though. Be careful not to tighten the new ones in tooo tight. Last resort ( I mean LAST) I have broke them and used a carrot or perfectly sculpted potato to remove the base. If you use this LAST resort then make sure the power is shut off at the breaker while removing the base.